1215125664 has 24 divisors (see below), whose sum is σ = 3189705120. Its totient is φ = 405041856.

The previous prime is 1215125617. The next prime is 1215125669. The reversal of 1215125664 is 4665215121.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×1215125664² = 2953060758622881792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1215125669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6328684 + ... + 6328875.

It is an arithmetic number, because the mean of its divisors is an integer number (132904380).

Almost surely, 2^1215125664 is an apocalyptic number.

It is an amenable number.

1215125664 is an abundant number, since it is smaller than the sum of its proper divisors (1974579456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215125664 is a wasteful number, since it uses less digits than its factorization.

1215125664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12657572 (or 12657564 counting only the distinct ones).

The product of its digits is 14400, while the sum is 33.

The square root of 1215125664 is about 34858.6526417760. The cubic root of 1215125664 is about 1067.1047780163.

The spelling of 1215125664 in words is "one billion, two hundred fifteen million, one hundred twenty-five thousand, six hundred sixty-four".